feat: conditionalize package check based on event type

Author: IShix-g

.github/workflows/check-and-upload-package.yaml

@@ -13,6 +13,7 @@ on:
 jobs:
   check-package:
     runs-on: ubuntu-22.04
+    if: ${{ github.event_name == 'workflow_dispatch' || github.event.pull_request.merged }}
     outputs:
       file-present: ${{ steps.check-file.outputs.file-present }}
       closest-release: ${{ steps.find-release.outputs.closest-release }}